U.S. patent number 10,735,055 [Application Number 16/075,320] was granted by the patent office on 2020-08-04 for method and device for reducing complexity of channel quantization.
This patent grant is currently assigned to ZTE CORPORATION. The grantee listed for this patent is ZTE CORPORATION. Invention is credited to Jianxing Cai, Yijian Chen, Yong Li, Yu Ngok Li, Zhaohua Lu, Hao Wu, Huahua Xiao.
![](/patent/grant/10735055/US10735055-20200804-D00000.png)
![](/patent/grant/10735055/US10735055-20200804-D00001.png)
![](/patent/grant/10735055/US10735055-20200804-D00002.png)
![](/patent/grant/10735055/US10735055-20200804-D00003.png)
![](/patent/grant/10735055/US10735055-20200804-D00004.png)
United States Patent |
10,735,055 |
Chen , et al. |
August 4, 2020 |
Method and device for reducing complexity of channel
quantization
Abstract
Embodiments of the present invention provide a method and device
for reducing complexity of channel quantization. The method
comprises: determining, on the basis of whether a measurement
feedback parameter configured by a channel state information (CSI)
process satisfies a predetermined condition, a CSI report
time-domain position and a time interval requirement parameter
Nrpt-ref for a CSI reference resource time-domain position, or
determining a CSI trigger time-domain position and a time interval
requirement parameter Nrpt-ref for a CSI reference resource
time-domain position; determining, according to the determined time
interval requirement parameter Nrpt-ref and the CSI report
time-domain position, the CSI reference resource time-domain
position, or determining, according to the determined time interval
requirement parameter Nrpt-ref and the CSI trigger time-domain
position, the CSI reference resource time-domain position; and
performing CSI quantization according to the determined CSI
reference resource time-domain position.
Inventors: |
Chen; Yijian (Shenzhen,
CN), Li; Yu Ngok (Shenzhen, CN), Lu;
Zhaohua (Shenzhen, CN), Xiao; Huahua (Shenzhen,
CN), Cai; Jianxing (Shenzhen, CN), Wu;
Hao (Shenzhen, CN), Li; Yong (Shenzhen,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
ZTE CORPORATION |
Shenzhen |
N/A |
CN |
|
|
Assignee: |
ZTE CORPORATION (Shenzhen,
CN)
|
Family
ID: |
1000004966916 |
Appl.
No.: |
16/075,320 |
Filed: |
January 23, 2017 |
PCT
Filed: |
January 23, 2017 |
PCT No.: |
PCT/CN2017/072255 |
371(c)(1),(2),(4) Date: |
August 03, 2018 |
PCT
Pub. No.: |
WO2017/133549 |
PCT
Pub. Date: |
August 10, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20190068252 A1 |
Feb 28, 2019 |
|
Foreign Application Priority Data
|
|
|
|
|
Feb 5, 2016 [CN] |
|
|
2016 1 0082766 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L
5/0057 (20130101); H04B 7/0647 (20130101); H04L
5/005 (20130101); H04B 7/0417 (20130101); H04W
72/0446 (20130101); H04W 72/048 (20130101); H04B
7/0456 (20130101); H04L 25/0202 (20130101); H04L
5/0007 (20130101); H04B 7/0626 (20130101); H04L
5/14 (20130101); H04B 7/0482 (20130101) |
Current International
Class: |
H04B
7/0417 (20170101); H04W 72/04 (20090101); H04B
7/06 (20060101); H04B 7/0456 (20170101); H04L
5/00 (20060101); H04L 5/14 (20060101); H04L
25/02 (20060101) |
Field of
Search: |
;375/260,267 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
102036376 |
|
Apr 2011 |
|
CN |
|
103716818 |
|
Apr 2014 |
|
CN |
|
104935389 |
|
Sep 2015 |
|
CN |
|
Other References
International Search Report in international application No.
PCT/CN2017/072255, dated Mar. 28, 2017, 2 pgs. cited by applicant
.
English Translation of the Written Opinion of the International
Search Authority in international application No.
PCT/CN2017/072255, dated Mar. 28, 2017, 4 pgs. cited by
applicant.
|
Primary Examiner: Hailegiorgis; Fitwi Y
Attorney, Agent or Firm: Cooper Legal Group, LLC
Claims
The invention claimed is:
1. A method for reducing complexity of channel quantization, the
method being applied to a terminal and comprising: determining a
Channel State Information (CSI) report time-domain position and a
time interval requirement parameter for a CSI reference resource
time-domain position according to whether a measurement feedback
parameter configured by a CSI process satisfies a first
predetermined condition, or determining a CSI trigger time-domain
position and an interval condition requirement parameter for the
CSI reference resource time-domain position according to whether
the measurement feedback parameter configured by the CSI process
satisfies a second predetermined condition; determining the CSI
reference resource time-domain position according to the determined
time interval requirement parameter and CSI report time-domain
position, or determining the CSI reference resource time-domain
position according to the determined interval condition requirement
parameter and CSI trigger time-domain position; and performing CSI
quantization according to the determined CSI reference resource
time-domain position, wherein the predetermined conditions comprise
one of the following: a CSI feedback mode configured by the CSI
process belongs to a set of CSI feedback modes; a codebook
parameter configured by the CSI process belongs to a set of
codebook parameters; a total number of ports for measuring a pilot
configured by the CSI process belongs to a set of numbers of ports;
or a number of pilots configured by the CSI process belongs to a
set of numbers of pilots.
2. The method according to claim 1, after the CSI quantization is
performed, further comprising: feeding back the quantized CSI.
3. The method according to claim 1, before determining the time
interval requirement parameter or determining the interval
condition requirement parameter, further comprising: according to a
capability level of the terminal, or a duplex mode, or a frame
structure type, or Precoding Matrix Indicator (PMI) enabling
signaling, or a configured transmission mode, or a number of
configured processes, or a number of triggered processes, or a
configured feedback class, determining one of the following: a CSI
feedback mode comprised in the set of CSI feedback modes; a
codebook parameter comprised in the set of codebook parameters; a
number of ports comprised in the set of the numbers of ports; or a
number of pilots comprised in the set of the numbers of pilots.
4. The method according to claim 3, wherein when a plurality of
processes are configured or triggered, the set of the numbers of
ports is a union of the sets of the total number of ports for
measuring the pilot corresponding to the plurality of
processes.
5. The method according to claim 3, wherein when a plurality of
processes are configured or triggered, the set of the numbers of
pilots is a union of the sets of the number of pilots corresponding
to the plurality of processes.
6. The method according to claim 1, wherein when the configured
number of pilots is less than 4, the time interval requirement
parameter is x; and when the configured number of pilots is greater
than or equal to 4, the time interval requirement parameter is y,
wherein x and y are integers, and y is greater than x.
7. A device for reducing complexity of channel quantization, which
is set in a terminal, comprising a processor, a memory, and one or
more modules stored on the memory and executable by the processor,
the one or more modules comprising: a first determining module
configured to: determine a Channel State Information (CSI) report
time-domain position and a time interval requirement parameter for
a CSI reference resource time-domain position according to whether
a measurement feedback parameter configured by a CSI process
satisfies a first predetermined condition, or determine a CSI
trigger time-domain position and an interval condition requirement
parameter for the CSI reference resource time-domain position
according to whether the measurement feedback parameter configured
by the CSI process satisfies a second predetermined condition; a
second determining module configured to: determine the CSI
reference resource time-domain position according to the determined
time interval requirement parameter and CSI report time-domain
position, or determine the CSI reference resource time-domain
position according to the determined interval condition requirement
parameter and CSI trigger time-domain position; and a quantization
module configured to: perform CSI quantization according to the
determined CSI reference resource time-domain position, wherein the
predetermined conditions comprise one of the following: a CSI
feedback mode configured by the CSI process belongs to a set of CSI
feedback modes; a codebook parameter configured by the CSI process
belongs to a set of codebook parameters; a total number of ports
for measuring a pilot configured by the CSI process belongs to a
set of numbers of ports; or a number of pilots configured by the
CSI process belongs to a set of numbers of pilots.
8. The device according to claim 7, the one or more modules further
comprising: a feedback module configured to feed back the quantized
CSI.
9. The device according to claim 7, the one or more modules further
comprising a setting module configured to determine, according to a
capability level of the terminal, or a duplex mode, or a frame
structure type, or Precoding Matrix Indicator (PMI) enabling
signaling, or a configured transmission mode, or a number of
configured processes, or a number of triggered processes, or a
configured feedback class, one of the following: a CSI feedback
mode comprised in the set of CSI feedback modes; a codebook
parameter comprised in the set of codebook parameters; a number of
ports comprised in the set of the numbers of ports; or a number of
pilots comprised in the set of the numbers of pilots.
10. The device according to claim 9, wherein the setting module is
further configured to, when a plurality of processes are configured
or triggered, determine that the set of the numbers of ports is a
union of the sets of the total number of ports for measuring the
pilot corresponding to the plurality of processes.
11. The device according to claim 9, wherein the setting module is
further configured to, when a plurality of processes are configured
or triggered, determine that the set of the numbers of pilots is a
union of the sets of the number of pilots corresponding to the
plurality of processes.
12. A non-transitory computer readable storage medium, in which
computable executable instructions are stored; the computable
executable instructions are used for performing a method for
reducing complexity of channel quantization, the method comprising:
determining a Channel State Information (CSI) report time-domain
position and a time interval requirement parameter for a CSI
reference resource time-domain position according to whether a
measurement feedback parameter configured by a CSI process
satisfies a first predetermined condition, or determining a CSI
trigger time-domain position and an interval condition requirement
parameter for the CSI reference resource time-domain position
according to whether the measurement feedback parameter configured
by the CSI process satisfies a second predetermined condition;
determining the CSI reference resource time-domain position
according to the determined time interval requirement parameter and
CSI report time-domain position, or determining the CSI reference
resource time-domain position according to the determined interval
condition requirement parameter and CSI trigger time-domain
position; and performing CSI quantization according to the
determined CSI reference resource time-domain position, wherein the
predetermined conditions comprise one of the following: a CSI
feedback mode configured by the CSI process belongs to a set of CSI
feedback modes; a codebook parameter configured by the CSI process
belongs to a set of codebook parameters; a total number of ports
for measuring a pilot configured by the CSI process belongs to a
set of numbers of ports; or a number of pilots configured by the
CSI process belongs to a set of numbers of pilots.
13. The non-transitory computer readable storage medium according
to claim 12, wherein after the CSI quantization is performed, the
method further comprises: feeding back the quantized CSI.
14. The non-transitory computer readable storage medium according
to claim 12, wherein before determining the time interval
requirement parameter or determining the interval condition
requirement parameter, the method further comprises: according to a
capability level of a terminal, or a duplex mode, or a frame
structure type, or Precoding Matrix Indicator (PMI) enabling
signaling, or a configured transmission mode, or a number of
configured processes, or a number of triggered processes, or a
configured feedback class, determining one of the following: a CSI
feedback mode comprised in the set of CSI feedback modes; a
codebook parameter comprised in the set of codebook parameters; a
number of ports comprised in the set of the numbers of ports; or a
number of pilots comprised in the set of the numbers of pilots.
15. The non-transitory computer readable storage medium according
to claim 14, wherein when a plurality of processes are configured
or triggered, the set of the numbers of ports is a union of the
sets of the total number of ports for measuring the pilot
corresponding to the plurality of processes.
16. The non-transitory computer readable storage medium according
to claim 14, wherein when a plurality of processes are configured
or triggered, the set of the numbers of pilots is a union of the
sets of the number of pilots corresponding to the plurality of
processes.
17. The non-transitory computer readable storage medium according
to claim 12, wherein when the configured number of pilots is less
than 4, the time interval requirement parameter is x; and when the
configured number of pilots is greater than or equal to 4, the time
interval requirement parameter is y, wherein x and y are integers,
and y is greater than x.
Description
TECHNICAL FIELD
The present disclosure relates, but not limited, to the field of
mobile communications, and in particular to a method and device for
reducing complexity of channel quantization.
BACKGROUND
In a wireless communication system, a sending end and a receiving
end usually use multiple antennas to send and receive, so as to get
a higher rate. A principle of multi-antenna technology is using
some characteristics of a channel to form multi-layer transmissions
matching the characteristics of the channel. Through the
multi-antenna technology, a radiation direction of a signal is
highly targeted, which can improve system performance effectively.
A significant performance improvement is achieved without
increasing bandwidth and power. Therefore, the multi-antenna
technology is a very promising technology and widely applied in
current systems. Data transmission performance of a multi-antenna
system mainly depends on measurement and feedback of channel
information, so the measurement and feedback of channel information
is the core of the multi-antenna technology. How to ensure
accuracy, overhead and robustness of channel measurement and
channel information feedback becomes an important problem.
Basic contents related to Channel State Information (CSI) in a Long
Term Evolution (LTE) system are as follows.
The basic contents include the content of CSI feedback. Implicit
CSI feedback generally includes Channel Quality Indication (CQI),
Precoding Matrix Indicator (PMI) and Rank Indicator (RI). The CQI
is an indicator for measuring the quality of a downlink channel. In
a protocol 36-213, the CQI is represented by integer values from 0
to 15, respectively representing different CQI levels; and
different CQIs correspond to their respective Modulation and Coding
Schemes (MCS) and encoding rates. The RI is used for describing the
number of independent spatial channels, corresponding the rank of a
channel response matrix. In an open-loop spatial multiplexing mode
and a closed-loop spatial multiplexing mode, a piece of User
Equipment (UE) is required to feedback RI information. In other
modes, there is no need to feed back the RI information. The rank
of the channel response matrix corresponds to the number of layers.
The PMI feeds back the best precoding information, which indicates,
based on an index feedback, a code word best matching the
characteristic of the current channel in an agreed codebook.
The basic contents also include two modes of CSI feedback. There
are mainly two modes of CSI feedback of a terminal. A base station
may configure the terminal to measure and quantize the channel
information, and periodically feedback the quantized CSI (including
the RI, the PMI, and the CQI) through a Physical Uplink Control
Channel (PUCCH). The base station may also trigger, if needed, the
terminal to report the CSI (including the RI, the PMI, and the CQI)
aperiodically and unexpectedly, so as to overcome the problem that
real-time performance of periodical feedback is modest and CSI
quantization accuracy is limited to the control of channel
overhead.
The basic contents also include a CSI process. The 3GPP introduces
a concept of CSI process. The base station may configure multiple
CSI processes for the terminal. Each CSI process is equivalent to a
CSI measurement and feedback process. Each CSI process is
independent from other CSI processes, and parameters are configured
separately. One process is supported in a transmission mode 9, and
at most four processes may be supported in a transmission mode 10.
The configuration of channel measurement part and the configuration
of interference measurement part and feedback mode are defined in
the configuration of each CSI process.
The basic contents also include a feedback class. The design of the
measurement and feedback of the CSI is comparatively simple in an
early LTE system version. Early CSI feedback only supports the
configuration of a small set of pilot ports (2, 4, 8) and
low-dimensional feedback, wherein all the pilot ports are
non-precoding pilot. However, with the number of antennas is
increasing and an accuracy requirement gets higher and higher, the
deployment of the base station becomes more and more diverse, so a
pilot overhead, a feedback overhead and complexity of feedback
quantization increase significantly. A new definition of CSI
feedback class is introduced in a new LTE version. There are two
specific feedback classes, which are respectively class A and class
B. The base station may configure the feedback class for each CSI
process. The class A supports a high-dimensional 2D antenna
topology (supporting more than eight ports), and the feedback is
based on high-dimensional non-precoding pilot measurement, and uses
the high-accuracy codebook. The class B supports the configuration
of multiple precoding CSI Reference Signals (CSI-RSs) to perform
beam selection (the number of pilots is greater than 1, and the
total number of ports may be greater than 8), in such case, the
CSI-RS sent by the base station is generally a precoding pilot; the
UE may need to first perform precoding pilot selection or resource
selection of the precoding pilot, and then perform, based on a
selected CSI-RS resource, quantization feedback of the channel
information, including resource selection information CSI-RS
Resource Index (CRI) and the RI, PMI and CQI corresponding to the
selected CSI-RS resource.
For some new feedback classes introduced, a pilot dimension
corresponding to the feedback of class A is usually high, and more
than eight ports, so complexity of channel estimation will increase
exponentially; at the same time, a codebook dimension used in the
process of channel quantization is large, the number of code words
increases by several times compared with the previous number code
words, so complexity of code word selection will be very high. The
class B needs to perform channel measurement and interference
measurement to multiple pilots, and needs to perform performance
comparison after quantization to the channel information of
multiple pilots, so complexity is also very high. Therefore, both
the feedback of class A and the feedback of class B bring a big
challenge to implementation complexity and cost of the
terminal.
SUMMARY
The following is an overview of the theme elaborated in this
application. The overview is not intended to limit the scope of
protection of the claims.
The present disclosure provides a method and device for reducing
complexity of channel quantization, which may ensure to reduce
complexity of the terminal without a significant performance
loss.
The method for reducing complexity of channel quantization, which
is provided by the disclosure and applied to the terminal, includes
following actions.
A CSI report time-domain position and a time interval requirement
parameter N.sub.rpt-ref for a CSI reference resource time-domain
position are determined according to whether a measurement feedback
parameter configured by a CSI process satisfies a first
predetermined condition. Or a CSI trigger time-domain position and
an interval condition requirement parameter N.sub.trg-ref for the
CSI reference resource time-domain position are determined
according to whether the measurement feedback parameter configured
by the CSI process satisfies a second predetermined condition.
The CSI reference resource time-domain position is determined
according to the determined time interval requirement parameter
N.sub.rpt-ref and CSI report time-domain position. Or the CSI
reference resource time-domain position is determined according to
the determined interval condition requirement parameter
N.sub.trg-ref and CSI trigger time-domain position.
CSI quantization is performed according to the determined CSI
reference resource time-domain position.
According to an embodiment, the predetermined conditions include
one of the followings:
a feedback mode configured by the CSI process, belongs to a set of
feedback modes S1;
a codebook parameter configured by the CSI process, belongs to a
set of codebook parameters S2;
a total number of ports for measuring the pilot, which is
configured by the CSI process, belongs to a set of numbers of ports
S3; or a number of pilots K configured by the CSI process, belongs
to a set of numbers of pilots S4.
According to an embodiment, after the CSI quantization is
performed, the method further includes following action. The
quantized CSI is fed back.
According to an embodiment, before the time interval requirement
parameter N.sub.rpt-ref or the interval condition requirement
parameter N.sub.trg-ref is determined, the method further includes
the following actions. According to a capability level of the
terminal, or a duplex mode, or a frame structure type, or PMI
enabling signaling, or a configured transmission mode, or the
number of configured processes, or the number of triggered
processes, or a configured feedback class, one of the followings is
determined:
the feedback mode included in the set of feedback modes S1;
the codebook parameter included in the set of codebook parameters
S2;
the number of ports included in the set of the numbers of ports S3;
or
the number of pilots included in the set of the numbers of pilots
S4.
According to an embodiment, when multiple processes are configured
or triggered, the set of the numbers of ports S3 is an union of the
sets of the total number of ports for measuring the pilot
corresponding to the multiple processes.
According to an embodiment, when multiple processes are configured
or triggered, the set of the numbers of pilots S4 is an union of
the sets of the number of pilots corresponding to the multiple
processes.
According to an embodiment, when the configured number of pilots K
is less than 4, the time interval requirement parameter
N.sub.rpt-ref is x. When the configured number of pilots K is
greater than or equal to 4, the time interval requirement parameter
N.sub.rpt-ref is y. The x and the y are integers, and the y is
greater than x.
The disclosure also provides a device for reducing complexity of
channel quantization, which is set in the terminal, and includes a
first determining module 21, a second determining module 22 and a
quantization module 23.
The first determining module 21 is configured to determine the CSI
report time-domain position and the time interval requirement
parameter N.sub.rpt-ref for the CSI reference resource time-domain
position according to whether the measurement feedback parameter
configured by the CSI process satisfies the first predetermined
condition, or determine the CSI trigger time-domain position and
the interval condition requirement parameter N.sub.trg-ref for the
CSI reference resource time-domain position according to whether
the measurement feedback parameter configured by the CSI process
satisfies the second predetermined condition.
The second determining module 22 is configured to determine the CSI
reference resource time-domain position according to the determined
time interval requirement parameter N.sub.rpt-ref and CSI report
time-domain position, or determine the CSI reference resource
time-domain position according to the determined interval condition
requirement parameter N.sub.trg-ref and CSI trigger time-domain
position.
The quantization module 23 is configured to perform the CSI
quantization according to the determined CSI reference resource
time-domain position.
According to an embodiment, the device further includes: a feedback
module 24, which is configured to feed back the quantized CSI.
According to an embodiment, the device further includes: a setting
module 25, which is configured to determine, according to the
capability level of the terminal, or the duplex mode, or the frame
structure type, or the PMI enabling signaling, or the configured
transmission mode, or the number of configured processes, or the
number of triggered processes, or the configured feedback class,
one of the followings:
a feedback mode included in a set of feedback modes S1;
a codebook parameter included in a set of codebook parameters
S2;
a number of ports included in a set of numbers of ports S3; or
a number of pilots included in a set of numbers of pilots S4.
According to an embodiment, the setting module 25 is further
configured to, when multiple processes are configured or triggered,
determine that the set of the numbers of ports S3 is an union of
the sets of the total number of ports for measuring the pilot
corresponding to the multiple processes.
According to an embodiment, the setting module 25 is further
configured to, when multiple processes are configured or triggered,
determine that the set of the numbers of pilots S4 is an union of
the sets of the number of pilots corresponding to the multiple
processes.
The disclosure also provides a computer readable storage medium, in
which computable executable instructions are stored. The computable
executable instructions are used for performing the above
method.
A solution provided by the disclosure achieves an optimal tradeoff
between the performance loss and complexity according to the
current conditions; through the solution, there is no significant
performance loss while a benefit of complexity reduction is
obtained, and the complexity of terminal is reduced, thereby
reducing the cost of the terminal indirectly.
Other aspects can be understood after the accompanying drawings and
detailed descriptions are read and understood.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 illustrates a flowchart of a method for reducing complexity
of channel quantization according to embodiment 1 of the
disclosure.
FIG. 2 illustrates a structure diagram of a device for reducing
complexity of channel quantization according to embodiment 2 of the
disclosure.
FIG. 3 illustrates a structure diagram of another device for
reducing complexity of channel quantization according to embodiment
2 of the disclosure.
FIG. 4 illustrates a structure diagram of another device for
reducing complexity of channel quantization according to embodiment
2 of the disclosure.
DETAILED DESCRIPTION
Embodiments of the present disclosure are elaborated below in
combination with the accompanying drawings. It is to be noted that
the embodiments and the features in the embodiments of the
application can be combined with each other under the condition of
no conflicts.
Embodiment 1
As shown in FIG. 1, the embodiment of the disclosure provides a
method for reducing complexity of channel quantization, which is
applied to the terminal and includes the following steps.
At S1, the CSI report time-domain position and the time interval
requirement parameter N.sub.rpt-ref for the CSI reference resource
time-domain position are determined according to whether the
measurement feedback parameter configured by the CSI process
satisfies the first predetermined condition, or the CSI trigger
time-domain position and the interval condition requirement
parameter N.sub.trg-ref for the CSI reference resource time-domain
position are determined according to whether the measurement
feedback parameter configured by the CSI process satisfies the
second predetermined condition.
At S2, the CSI reference resource time-domain position is
determined according to the determined time interval requirement
parameter N.sub.rpt-ref and CSI report time-domain position, or the
CSI reference resource time-domain position is determined according
to the determined interval condition requirement parameter
N.sub.trg-ref and CSI trigger time-domain position.
At S3, the CSI quantization is performed according to the
determined CSI reference resource time-domain position.
According to an embodiment, the predetermined conditions include
one of the followings:
the feedback mode configured by the CSI process, belongs to the set
of feedback modes S1;
the codebook parameter configured by the CSI process, belongs to
the set of codebook parameters S2;
the total number of ports for measuring the pilot, which is
configured by the CSI process, belongs to the set of the numbers of
ports S3; or
the number of pilots K configured by the CSI process, belongs to
the set of the numbers of pilots S4.
Both the first predetermined condition and the second predetermined
condition may be selected from the above scope. The first
predetermined condition and the second predetermined condition may
be the same or different.
According to an embodiment, after the CSI quantization is
performed, the method further includes that: the quantized CSI is
fed back.
According to an embodiment, before the time interval requirement
parameter N.sub.rpt-ref or the interval condition requirement
parameter N.sub.trg-ref is determined, the method further includes
the following steps. According to the capability level of the
terminal, or the duplex mode, or the frame structure type, or the
PMI enabling signaling, or the configured transmission mode, or the
number of configured processes, or the number of triggered
processes, or the configured feedback class, one of the followings
is determined:
the feedback mode included in the set of feedback modes S1;
the codebook parameter included in the set of codebook parameters
S2;
the number of ports included in the set of the numbers of ports S3;
or
the number of pilots included in the set of the numbers of pilots
S4.
According to an embodiment, when multiple processes are configured
or triggered, the set of the numbers of ports S3 is an union of the
sets of the total number of ports for measuring the pilot
corresponding to the multiple processes.
According to an embodiment, when multiple processes are configured
or triggered, the set of the numbers of pilots S4 is an union of
the sets of the number of pilots corresponding to the multiple
processes.
According to an embodiment, when the configured number of pilots K
is less than 4, the time interval requirement parameter
N.sub.rpt-ref is x. When the configured number of pilots K is
greater than or equal to 4, the time interval requirement parameter
N.sub.rpt-ref is y. The x and the y are integers, and the y is
greater than x.
Embodiment 2
As shown in FIG. 2, the embodiment provides a device for reducing
complexity of channel quantization, which is set in the terminal
and includes a first determining module 21, a second determining
module 22 and the quantization module 23.
The first determining module 21 is configured to determine the CSI
report time-domain position and the time interval requirement
parameter N.sub.rpt-ref for the CSI reference resource time-domain
position according to whether the measurement feedback parameter
configured by the CSI process satisfies the first predetermined
condition, or determine the CSI trigger time-domain position and
the interval condition requirement parameter N.sub.trg-ref for the
CSI reference resource time-domain position according to whether
the measurement feedback parameter configured by the CSI process
satisfies the second predetermined condition.
The second determining module 22 is configured to determine the CSI
reference resource time-domain position according to the determined
time interval requirement parameter N.sub.rpt-ref and CSI report
time-domain position, or determine the CSI reference resource
time-domain position according to the determined interval condition
requirement parameter N.sub.trg-ref and CSI trigger time-domain
position.
The quantization module 23 is configured to perform the CSI
quantization according to the determined CSI reference resource
time-domain position.
According to an embodiment, as illustrated in FIG. 3, the device
further includes a feedback module 24 configured to feed back the
quantized CSI.
According to an embodiment, as illustrated in FIG. 4, the device
further includes a setting module 25. The setting module 25 is
configured to determine, according to the capability level of the
terminal, or the duplex mode, or the frame structure type, or the
PMI enabling signaling, or the configured transmission mode, or the
number of configured processes, or the number of triggered
processes, or the configured feedback class, one of the
followings:
the feedback mode included in the set of feedback modes S1;
the codebook parameter included in the set of codebook parameters
S2;
the number of ports included in the set of the numbers of ports S3;
or
the number of pilots included in the set of the numbers of pilots
S4.
According to an embodiment, the setting module 25 is further
configured to, when multiple processes are configured or triggered,
determine that the set of the numbers of ports S3 is an union of
the sets of the total number of ports for measuring the pilot
corresponding to the multiple processes.
According to an embodiment, the setting module 25 is further
configured to, when multiple processes are configured or triggered,
determine that the set of the numbers of pilots S4 is an union of
the sets of the number of pilots corresponding to the multiple
processes.
An illustration is given below through several application
embodiments.
Application Embodiment 1
In a Multiple Input Multiple Output (MIMO) system, a flow that the
terminal measures and feeds back the CSI includes the following
steps.
At S101, the terminal determines whether it is needed to report the
CSI periodically or aperiodically. If there is the CSI needing to
be reported, S102 is performed. If not, the flow is ended.
At S102, the terminal determines the class of the CSI needing to be
fed back and a position of reporting the CSI.
The periodical CSI generally does not need extra dynamic trigger
signaling, but the aperiodical CSI needs to be triggered in
downlink control signaling. After trigger, the terminal performs
CSI calculation, and reports the CSI after some subframes.
There are many CSI classes, mainly including the RI, the PMI, the
CQI and the CRI.
The CSI feedback class is generally determined according to the CSI
process and its corresponding feedback mode, and the feedback mode
defines a combination of the CSI (the CQI, the PMI, and the RI)
feedback classes. In the embodiment, the CSI feedback class is
determined by a feedback granularity, a feedback position and
feedback content. Herein, an aperiodical feedback is transmitted on
a Physical Uplink Shared Channel (PUSCH), including the mode shown
in Table 1. A periodical feedback mode is the mode periodically
performing feedback on a Physical Uplink Control Channel (PUCCH),
including the mode shown in Table 2.
TABLE-US-00001 TABLE 1 PMI feedback class Single Multiple No PMI
PMI PMIs PUSCH CQI Broadband Mode 1-2 feedback class (broadband
CQI) UE selection Mode 2-0 Mode 2-2 (sub-band CQI) High-level Mode
3-0 Mode 3-1 Mode 3-2 configuration (sub-band CQI)
TABLE-US-00002 TABLE 2 PMI feedback class No PMI Single PMI PUCCH
CQI Broadband Mode 1-0 Mode 1-1 Feedback class (broadband CQI) UE
selection Mode 2-0 Mode 2-1 (sub-band CQI)
The above feedback modes define the content of the CSI needing to
be fed back by the terminal, referring to the LTE physical layer
protocol specification TS 36.213. The feedback modes which can be
configured in different transmission modes are not completely the
same, and each transmission mode corresponds to a candidate set of
feedback modes which can be configured.
At S103, the terminal determines a reference resource corresponding
to this CSI feedback.
Generally, the reference resource is a reference object of the CSI
quantization, and a reference resource position may be
comparatively fixed, and has a certain relationship with the
position of reporting the CSI (the N.sub.rpt subframe) or a
position of triggering the CSI N.sub.trg (corresponding to an
aperiodical CSI report). For example, when a single CSI process is
configured, the reference resource position is the subframe
satisfying the following conditions:
condition 1: the subframe is at the (N.sub.rpt-N.sub.rpt-ref)th
subframe or before it;
condition 2: the subframe is valid (the definition about the
subframe is valid may refer to the protocol TS 36.213 of the
3GPP);
condition 3: the subframe is nearest to the position of reporting
the CSI when the other conditions are satisfied;
N.sub.rpt-ref=m, and the m is greater than 0; for example, it may
be 8; a frequency-domain position is some Resource Blocks (RB) or
subbands corresponding to the CSI.
If it is the aperiodical feedback, the reference resource position
may also be the subframe satisfying the following conditions:
condition 4: the subframe is at the (N.sub.trg-N.sub.trg-ref)th
subframe or before it;
condition 5: the subframe is valid (the definition about the
subframe is valid may refer to the protocol TS 36.213 of the
3GPP);
condition 6: the subframe is nearest to the position of triggering
the CSI when the other conditions are satisfied;
N.sub.trg-ref=n, and the n is an integer; for example, it may be
4.
At S104, the terminal may perform a channel estimation, PMI
quantization, a CQI calculation, and a rank calculation of a
channel after determining the reference resource position of the
CSI; if there are multiple CSI-RSs configured, the terminal may
perform a CSI-RS selection, and report selected CRI information to
the base station.
In the above process, when a value of the N.sub.rpt-ref or the
N.sub.trg-ref is determined according to different conditions, the
N.sub.rpt-ref or the N.sub.trg-ref may be set to a fixed value;
that is, for many cases, there are multiple corresponding fixed
values.
Application Embodiment 2
At S201, the base station configures the feedback of class A or the
feedback of class B for the terminal, and sets two values of the
N.sub.rpt-ref, that is, the N.sub.rpt-ref is equal to m1 and m2; or
the base station sets two values of the N.sub.trg-ref, that is, the
N.sub.trg-ref is equal to n1 and n2.
At S202, the terminal determines whether the following condition is
satisfied; when the condition is satisfied, the terminal determines
that the value of the N.sub.rpt-ref is m1; when the condition is
not satisfied, the terminal determines that the value of the
N.sub.rpt-ref is m2; or, when the condition is satisfied, the
terminal determines that the value of the N.sub.trg-ref is n1, and
when the condition is not satisfied, the terminal determines that
the value of the N.sub.trg-ref is n2.
In the embodiment, the condition is set as the feedback mode
configured by the CSI process belongs to the set of feedback modes
S1 agreed with the base station.
Herein, the S1 is a set; for example, it may be {Mode 3-2}, or
{Mode 3-1, Mode 3-2}, or {Mode 1-2, Mode 3-2}, or {Mode 3-1, Mode
1-2, Mode 3-2}, and so on.
According to an embodiment, the S1 may be an agreed fixed set.
According to an embodiment, the S1 may also be determined according
to the capability level of the terminal, and the terminals with
different capability levels correspond to different sets S1. For
example, for the terminal with high capability level, the set S1
may be set to a null set, that is, this terminal may work according
to the value of the N.sub.rpt-ref being m2 or the value of the
N.sub.trg-ref being n2 anytime.
According to an embodiment, the S1 may also be determined by the
terminal according to the duplex mode, or the frame structure type,
or the PMI enabling signaling. The sets S1 corresponding to the
different duplex modes may be different, the sets S1 corresponding
to the different frame structure types may be different, and the
sets S1 corresponding to enabling or disabling PMI configuration
may be different.
According to an embodiment, the S1 may also be determined according
to the number of the CSI processes. The sets S1 corresponding to a
situation of one CSI process and a situation of multiple CSI
processes may be different.
According to an embodiment, the S1 may also be determined according
to the transmission mode. The sets S1 corresponding to the
different transmission modes may be different.
According to an embodiment, the S1 may also be determined according
to the class. The sets S1 respectively corresponding to the class
A, the class B and a situation where the class is not configured
may be different.
At S203, after determining the values of the N.sub.rpt-ref and the
N.sub.trg-ref, the terminal may determine the CSI reference
resource time-domain position according to the determined
N.sub.rpt-ref and CSI report time-domain position, or determine the
CSI reference resource time-domain position according to the
determined N.sub.trg-ref and CSI trigger time-domain position.
At S204, the CSI quantization and feedback is performed according
to the determined CSI reference resource time-domain position.
Application Embodiment 3
At S301, the base station configures the feedback of class A or the
feedback of class B corresponding to multiple pilots for the
terminal, and sets two values of the N.sub.rpt-ref, that is, the
N.sub.rpt-ref is equal to m1 and m2; or the base station sets two
values of the N.sub.trg-ref, that is, the N.sub.trg-ref is equal to
n1 and n2.
At S302, the terminal determines whether the following condition is
satisfied; when the condition is satisfied, the terminal determines
that the value of the N.sub.rpt-ref is m1; when the condition is
not satisfied, the terminal determines that the value of the
N.sub.rpt-ref is m2; or, when the condition is satisfied, the
terminal determines that the value of the N.sub.trg-ref is n1, and
when the condition is not satisfied, the terminal determines that
the value of the N.sub.trg-ref is n2.
In the embodiment, the condition is set as the codebook parameter
configured by the CSI process belongs to the set of codebook
parameters S2 agreed with the base station.
Herein, the codebook parameters mainly include the following
parameters:
a first dimension N1, a second dimension N2, a first dimensional
vector density O1, a second dimensional vector density O2, a
sub-codebook selection, and a parameter about a limit to the number
of code words.
Herein, the S2 is a set; for example, it may be {all codebooks that
N1*N2 is configured to be greater than 8}, or {all possible
codebooks that N1*N2*O1*O2 is configured to be greater than or
equal to 32}, or {all possible codebooks that N1*N2*O1*O2 is
configured to be greater than or equal to 32 and the sub-codebook
selection is 2, 3, 4}, or {all codebooks that the total number of
code words is greater than 256}.
According to an embodiment, the S2 may be an agreed fixed set.
According to an embodiment, the S2 may also be determined according
to the capability level of the terminal, and the terminals with
different capability levels correspond to different sets S2. For
example, for the terminal with high capability level, the set S2
may be set to the null set, that is, this terminal may work
according to the value of the N.sub.rpt-ref being m2 or the value
of the N.sub.trg-ref being n2 anytime.
According to an embodiment, the S2 may also be determined by the
terminal according to the duplex mode, or the frame structure type,
or the PMI enabling signaling. The sets S2 corresponding to the
different duplex modes may be different, the sets S2 corresponding
to the different frame structure types may be different, and the
sets S2 corresponding to enabling or disabling PMI configuration
may be different.
According to an embodiment, the S2 may also be determined according
to the number of the CSI processes. The sets S2 corresponding to
the situation of one CSI process and the situation of multiple CSI
processes may be different.
According to an embodiment, the S2 may also be determined according
to the transmission mode. The sets S2 corresponding to the
different transmission modes may be different.
According to an embodiment, the S2 may also be determined according
to the class. The sets S2 respectively corresponding to the class A
and the class B may be different.
At S303, after determining the values of the N.sub.rpt-ref and the
N.sub.trg-ref, the terminal may determine the CSI reference
resource time-domain position according to the determined
N.sub.rpt-ref and CSI report time-domain position, or determine the
CSI reference resource time-domain position according to the
determined N.sub.trg-ref and CSI trigger time-domain position.
At S304, the CSI quantization and feedback is performed according
to the determined CSI reference resource time-domain position.
Application Embodiment 4
At S401, the base station configures the feedback of class A or the
feedback of class B for the terminal, and sets two values of the
N.sub.rpt-ref, that is, the N.sub.rpt-ref is equal to m1 and m2; or
the base station sets two values of the N.sub.trg-ref, that is, the
N.sub.trg-ref is equal to n1 and n2.
At S402, the terminal determines whether the following condition is
satisfied; when the condition is satisfied, the terminal determines
that the value of the N.sub.rpt-ref is m1; when the condition is
not satisfied, the terminal determines that the value of the
N.sub.rpt-ref is m2; or, when the condition is satisfied, the
terminal determines that the value of the N.sub.trg-ref is n1, and
when the condition is not satisfied, the terminal determines that
the value of the N.sub.trg-ref is n2.
In the embodiment, the condition is set as the total number of
ports for measuring the pilot belongs to the set of the numbers of
ports S3 agreed with the base station.
Herein, the S3 may be, for example, {the number of configurable
ports being greater than 8}, or {the number of configurable ports
being greater than or equal to 8}, or {the number of configurable
ports being greater than 12}, or {the number of configurable ports
being greater than or equal to 12}, or {the number of configurable
ports being greater than 16}, or {the number of configurable ports
being greater than or equal to 16}.
According to an embodiment, if a process is configured or
triggered, the total number of ports for measuring the pilot of the
process is counted.
According to an embodiment, if many processes are configured or
triggered, the total number of ports for measuring the pilot of the
multiple processes is counted jointly.
According to an embodiment, the S3 may be an agreed fixed set.
According to an embodiment, the S3 may also be determined according
to the capability level of the terminal, and the terminals with
different capability levels correspond to different sets S3. For
example, for the terminal with high capability level, the set S3
may be set to the null set, that is, this terminal may work
according to the value of the N.sub.rpt-ref being m2 or the value
of the N.sub.trg-ref being n2 anytime.
According to an embodiment, the S3 may also be determined by the
terminal according to the duplex mode, or the frame structure type,
or the PMI enabling signaling. The sets S3 corresponding to the
different duplex modes may be different, the sets S3 corresponding
to the different frame structure types may be different, and the
sets S3 corresponding to enabling or disabling PMI configuration
may be different.
According to an embodiment, the S3 may also be determined according
to the number of the CSI processes. The sets S3 corresponding to
the situation of one CSI process and the situation of multiple CSI
processes may be different.
According to an embodiment, the S3 may also be determined according
to the class. The sets S3 respectively corresponding to the class A
and the class B may be different.
According to an embodiment, the S3 may also be determined according
to the transmission mode. The sets S3 corresponding to the
different transmission modes may be different.
At S403, after determining the values of the N.sub.rpt-ref and the
N.sub.trg-ref, the terminal may determine the CSI reference
resource time-domain position according to the determined
N.sub.rpt-ref and CSI report time-domain position, or determine the
CSI reference resource time-domain position according to the
determined N.sub.trg-ref and CSI trigger time-domain position.
At S404, the CSI quantization and feedback is performed according
to the determined CSI reference resource time-domain position.
Application Embodiment 5
At S501, the base station configures the feedback of class A or the
feedback of class B for the terminal, and sets two values of the
N.sub.rpt-ref, that is, the N.sub.rpt-ref is equal to m1 and m2; or
the base station sets two values of the N.sub.trg-ref, that is, the
N.sub.trg-ref is equal to n1 and n2.
At S502, the terminal determines whether the following condition is
satisfied; when the condition is satisfied, the terminal determines
that the value of the N.sub.rpt-ref is m1; when the condition is
not satisfied, the terminal determines that the value of the
N.sub.rpt-ref is m2; or, when the condition is satisfied, the
terminal determines that the value of the N.sub.trg-ref is n1, and
when the condition is not satisfied, the terminal determines that
the value of the N.sub.trg-ref is n2, wherein the n2 is greater
than the n1, or the n2 is less than the n1.
In the embodiment, the condition is set as the number of pilots K
belongs to the set of the numbers of pilots S4 agreed with the base
station.
Herein, the S4 may be, for example, {numbers greater than 4}, or
{numbers greater than or equal to 4}, or {numbers greater than
2}.
According to an embodiment, if a process is configured or
triggered, the number of pilots of the process is counted.
According to an embodiment, if many processes are configured or
triggered, the number of pilots of the multiple processes is
counted jointly.
According to an embodiment, the S4 may be an agreed fixed set.
According to an embodiment, the S4 may also be determined according
to the capability level of the terminal, and the terminals with
different capability levels correspond to different sets S4. For
example, for the terminal with high capability level, the set S4
may be set to the null set, that is, this terminal may work
according to the value of the N.sub.rpt-ref being m2 or the value
of the N.sub.trg-ref being n2 anytime.
According to an embodiment, the S4 may also be determined by the
terminal according to the duplex mode, or the frame structure type,
or the PMI enabling signaling. The sets S4 corresponding to the
different duplex modes may be different, the sets S4 corresponding
to the different frame structure types may be different, and the
sets S4 corresponding to enabling or disabling PMI configuration
may be different.
According to an embodiment, the S4 may also be determined according
to the number of the CSI processes. The sets S4 corresponding to
the situation of one CSI process and the situation of multiple CSI
processes may be different.
According to an embodiment, the S4 may also be determined according
to the transmission mode. The sets S4 corresponding to the
different transmission modes may be different.
According to an embodiment, the S4 may also be determined according
to the class. The sets S4 respectively corresponding to the class A
and the class B may be different.
At S503, after determining the values of the N.sub.rpt-ref and the
N.sub.trg-ref, the terminal may determine the CSI reference
resource time-domain position according to the determined
N.sub.rpt-ref and CSI report time-domain position, or determine the
CSI reference resource time-domain position according to the
determined N.sub.trg-ref and CSI trigger time-domain position.
At S504, the CSI quantization and feedback is performed according
to the determined CSI reference resource time-domain position.
Application Example 6
In the above application examples, determining conditions may be
set jointly; for example, the following conditions need to be
satisfied simultaneously:
the feedback mode configured by the CSI process belongs to the set
of feedback modes S1 agreed with the base station and the codebook
parameter configured by the CSI process belongs to the set of
codebook parameters S2 agreed with the base station; or
the feedback mode configured by the CSI process belongs to the set
of feedback modes S1 agreed with the base station and the total
number of ports for measuring the pilot configured by the CSI
process belongs to the set of the numbers of ports S3 agreed with
the base station; or
the feedback mode configured by the CSI process belongs to the set
of feedback modes S1 agreed with the base station and the number of
pilots K configured by the CSI process belongs to the set of the
numbers of pilots S4 agreed with the base station; or
the total number of ports for measuring the pilot configured by the
CSI process belongs to the set of the numbers of ports S3 agreed
with the base station and the number of pilots K configured by the
CSI process belongs to the set of the numbers of pilots S4 agreed
with the base station.
The embodiments of the disclosure improve the determining of the
CSI reference resource position. The greater a time interval
between the CSI reference resource position and report, the lower
the complexity of the terminal, and for some situations requiring
high calculation complexity, it is needed to lower this
requirement, but it does not mean that the time interval needs to
be increased anytime. It is needed to avoid some cases where
increasing the time interval may cause the significant performance
loss; and in some cases, actually the UE does not face much
calculation pressure on channel measurement and quantization, so it
is needed to make a distinction among the cases.
Those of ordinary skill in the art should understand that the
technical solutions of the disclosure can be modified or replaced
equivalently without departing from their spirit and scope; and
these modifications and equivalent replacements shall fall within
the scope of claims of the disclosure.
Those ordinary skilled in the art may understand that all or some
of the steps in the above method disclosed, the system, the
functional modules/units in the device may be implemented as
software, firmware, hardware and a proper combination of them.
According to an embodiment of hardware, the division among the
functional modules/units mentioned in the above description does
not necessarily correspond to the division of physical units; for
example, a physical component may have multiple functions, or a
function or step may be performed by several physical components in
coordination. Some or all of the components may be implemented as
software performed a processor, for example, a digital signal
processor or a microprocessor, or implemented as hardware, or
implemented as an integrated circuit, for example, an
application-specific integrated circuit. Such software may be
distributed on computer readable media. The computer readable media
may include computer storage media (or non-temporary media) and
communication media (or temporary media). As those ordinary skilled
in the art know, the term computer storage media include volatile
and non-volatile media, and removable and un-removable media which
are implemented in any method or technology for storing information
(such as a computer readable instruction, a data structure, a
program module or other data). The computer storage media include,
but not limited to, an RAM, an ROM, an EEPROM, a flash memory or
other memory technologies, a CD-ROM, a Digital Video Disk (DVD) or
other optical storage, a cartridge, a tape, a disk storage or other
magnetic storage devices, or any other media which may be used for
storing expected information and may be accessed by a computer.
Moreover, as those ordinary skilled in the art know, the
communication media generally include the computer readable
instruction, the data structure, the program module or other data,
such as carriers or other transmission mechanisms, in a modulation
data signal, and may include any information delivery media.
INDUSTRIAL APPLICABILITY
The solution provided by the disclosure achieves an optimal
tradeoff between the performance loss and complexity according to
the current conditions; through the solution, there is no
significant performance loss while a benefit of complexity
reduction is obtained, and the complexity of terminal is reduced,
thereby reducing the cost of the terminal indirectly.
* * * * *